Shooting optical lens

Abstract

The invention relates to the field of optical lenses, and discloses a camera shooting optical lens which comprises four lenses which are sequentially a first lens with negative refraction power, a second lens with positive refraction power, a third lens with positive refraction power and a fourth lens with positive refraction power from the object side to the image side. The following conditional expressions are satisfied:-1.40 < = f1 / f < =-1.15; 35.00 < = FOV / Fno < = 60.00; 2.00 < = ET1 / d1 < = 2.90; 1.70 < = f3 / f4 < = 3.20; 0.60 < = (R3 + R4) / f2 < = 2.40. The camera shooting optical lens provided by the invention has the effects of large view field, large depth of field and high-definition imaging.

Description

[Technical field]

[0001] The present invention relates to the field of optical lenses, and in particular to a camera optical lens used in medical imaging equipment. [Background technology]

[0002] In recent years, with the rapid development of medical equipment, the demand for miniaturized optical lenses for endoscopy has been increasing. However, the molding quality of general optical lenses is poor and cannot meet the needs of medical imaging equipment.

[0003] In the related art, camera optical lenses mostly adopt three-piece, four-piece or even five-piece lens structures, among which four-piece lens structures are the most common. However, how to reasonably plan the focal length, thickness and surface shape of the lens under the premise of the same size of the four-piece lens structure to improve its field of view, depth of field and imaging quality has become the biggest problem today.

[0004] Therefore, a new camera optical lens is urgently needed to solve the above problems. [Summary of the invention]

[0005] In view of the above problems, the object of the present invention is to provide a new camera optical lens having the design requirements of a large field of view, a large depth of field and high-definition imaging.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a camera optical lens, which comprises four lenses in total, wherein the four lenses are, from the object side to the image side, a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, and a fourth lens with positive refractive power;

[0007] Among them, the focal length of the camera optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the field of view angle of 1.0 field of view of the camera optical lens is FOV, the aperture value of the camera optical lens is Fno, the edge thickness of the optical effective diameter of the first lens is ET1, the axial thickness of the first lens is d1, the central curvature radius of the object side of the second lens is R3, the central curvature radius of the image side of the second lens is R4, and the following conditional formula is satisfied:

[0008] -1.40≤f1 / f≤-1.15;

[0009] 35.00≤FOV / Fno≤66.00;

[0010] 2.00≤ET1 / d1≤2.90;

[0011] 1.70≤f3 / f4≤3.20;

[0012] 0.60≤(R3+R4) / f2≤2.40.

[0013] Preferably, the total optical length of the camera optical lens is TTL and satisfies the following conditional formula:

[0014] 5.50≤TTL / f≤7.00.

[0015] Preferably, at least one of the first lens, the second lens, the third lens and the fourth lens is made of glass.

[0016] Preferably, the maximum absolute value of the distortion within the 0.7 field of view of the camera optical lens is Dmax, and satisfies the following conditional formula:

[0017] Dmax≤2.00%.

[0018] Preferably, the image side surface of the first lens is concave at the paraxial position;

[0019] The total optical length of the camera optical lens is TTL, the central curvature radius of the object side of the first lens is R1, the central curvature radius of the image side of the first lens is R2, and the following conditional formula is satisfied:

[0020] 0.57≤(R1+R2) / (R1-R2)≤1.30;

[0021] 0.08≤d1 / TTL≤0.15.

[0022] Preferably, the object side surface of the second lens is convex at the paraxial position, and the image side surface of the second lens is concave at the paraxial position;

[0023] The total optical length of the camera optical lens is TTL, the axial thickness of the second lens is d3, and the following conditional formula is satisfied:

[0024] 2.09≤f2 / f≤3.99;

[0025] -7.23≤(R3+R4) / (R3-R4)≤-1.89;

[0026] 0.14≤d3 / TTL≤0.30.

[0027] Preferably, the image side surface of the third lens is convex at the paraxial position;

[0028] The total optical length of the camera optical lens is TTL, the central curvature radius of the object side of the third lens is R5, the central curvature radius of the image side of the third lens is R6, and the following conditional formula is satisfied:

[0029] 3.56≤f3 / f≤5.39;

[0030] -0.18≤(R5+R6) / (R5-R6)≤1.04;

[0031] 0.07≤d5 / TTL≤0.15.

[0032] Preferably, the object side surface of the fourth lens is convex at the paraxial position, and the image side surface of the fourth lens is convex at the paraxial position;

[0033] The total optical length of the camera optical lens is TTL, the central curvature radius of the object side of the fourth lens is R7, the central curvature radius of the image side of the fourth lens is R8, the axial thickness of the fourth lens is d7, and the following conditional formula is satisfied:

[0034] 1.62≤f4 / f≤2.02;

[0035] -0.16≤(R7+R8) / (R7-R8)≤0.71;

[0036] 0.10≤d7 / TTL≤0.23.

[0037] Preferably, the following conditions are met:

[0038] 2.19≤Fno≤3.37.

[0039] Compared with the related art, the camera optical lens of the present invention limits the ratio of the focal length of the first lens to the focal length of the camera optical lens, the ratio of the field of view angle of 1.0 of the camera optical lens to the aperture value of the camera optical lens, the ratio of the edge thickness of the optical effective diameter of the first lens to the axial thickness of the first lens, the ratio of the focal length of the third lens to the fourth focal length, and the surface shape of the second lens, so that a camera optical lens with a large field of view, a large depth of field and high-definition imaging can be obtained, which is particularly suitable for medical imaging equipment.

Brief Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0041] Figure 1 is a schematic structural diagram of an imaging optical lens according to a first embodiment;

[0042] Figure 2 yes Figure 1 Schematic diagram of axial aberration of the camera optical lens shown;

[0043] Figure 3 yes Figure 1 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0044] Figure 4 yes Figure 1 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0045] Figure 5 is a schematic structural diagram of a camera optical lens according to a second embodiment;

[0046] Figure 6 yes Figure 5 Schematic diagram of axial aberration of the camera optical lens shown;

[0047] Figure 7 yes Figure 5 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0048] Figure 8 yes Figure 5 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0049] Fig. 9 is a schematic structural diagram of a camera optical lens according to a third embodiment;

[0050] Fig.10 yes Fig. 9 Schematic diagram of axial aberration of the camera optical lens shown;

[0051] Fig.11 yes Fig. 9 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0052] Fig.12 yes Fig. 9 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0053] Fig.13 is a schematic structural diagram of an imaging optical lens according to a fourth embodiment;

[0054] Fig.14 yes Fig.13 Schematic diagram of axial aberration of the camera optical lens shown;

[0055] Fig.15 yes Fig.13 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0056] Fig.16 yes Fig.13 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0057] Fig.17is a schematic structural diagram of a camera optical lens according to a fifth embodiment;

[0058] Fig.18 yes Fig.17 Schematic diagram of axial aberration of the camera optical lens shown;

[0059] Fig.19 yes Fig.17 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0060] Fig. 20 yes Fig.17 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0061] Fig.21 is a schematic structural diagram of a camera optical lens according to a sixth embodiment;

[0062] Fig. 22 yes Fig.21 Schematic diagram of axial aberration of the camera optical lens shown;

[0063] Fig.23 yes Fig.21 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0064] Fig.24 yes Fig.21 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0065] Fig.25 is a schematic structural diagram of a camera optical lens according to a seventh embodiment;

[0066] Fig.26 yes Fig.25 Schematic diagram of axial aberration of the camera optical lens shown;

[0067] Fig. 27 yes Fig.25 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0068] Fig.28 yes Fig.25 Schematic diagram of field curvature and distortion of the camera optical lens shown. [Specific implementation method]

[0069] In order to make the purpose, technical scheme and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the embodiments of the present invention, many technical details are provided to enable readers to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present invention can be implemented.

[0070] With reference to the accompanying drawings, the present invention provides a camera optical lens 10, 20, 30, 40, 50, 60, 70, Figure 1 , Figure 5 , Fig. 9 , Fig.13 , Fig.17 , Fig.21 , Fig.25 , shown are the camera optical lenses 10, 20, 30, 40, 50, 60, 70 of the present invention, which include four lenses in total. Specifically, the camera optical lenses 10, 20, 30, 40, 50, 60, 70 include, from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, an aperture S1, a third lens L3 with positive refractive power, and a fourth lens L4 with positive refractive power. An optical element such as an optical filter GF may be provided between the fourth lens L4 and the image plane Si.

[0071] The focal length of the camera optical lenses 10, 20, 30, 40, 50, 60, and 70 is defined as f, and the focal length of the first lens L1 is f1, which satisfies the following condition: -1.40≤f1 / f≤-1.15, which specifies the ratio of the focal length of the first lens L1 to the focal length of the camera optical lenses 10, 20, 30, 40, 50, 60, and 70, that is, by reasonably allocating the optical focal lengths of the camera optical lenses 10, 20, 30, 40, 50, 60, and 70, they can have better imaging quality and lower sensitivity.

[0072] The field of view angle of 1.0 field of view of the camera optical lens 10, 20, 30, 40, 50, 60, 70 is defined as FOV, and the aperture value of the camera optical lens 10, 20, 30, 40, 50, 60, 70 is Fno, which satisfies the following condition: 35.00≤FOV / Fno≤66.00.

[0073] The edge thickness of the optical effective diameter of the first lens L1 is defined as ET1, and the middle thickness of the first lens L1 is defined as d1, which satisfy the following condition: 2.00≤ET1 / d1≤2.90. The ratio of the edge thickness of the first lens L1 to its center thickness is specified to facilitate lens processing and lens assembly.

[0074] The focal length of the third lens L3 is defined as f3, and the focal length of the fourth lens L4 is defined as f4, which satisfy the following condition: 1.70≤f3 / f4≤3.20, which specifies the ratio of the focal length of the third lens L3 to the focal length of the fourth lens L4. By reasonably allocating the optical focal lengths of the camera optical lenses 10, 20, 30, 40, 50, 60, and 70, it helps to smoothly transition the light and improve the imaging quality.

[0075] The focal length of the second lens L2 is defined as f2, the central curvature radius of the object side surface of the second lens L2 is R3, and the central curvature radius of the image side surface of the second lens L2 is R4, which satisfies the following condition: 0.60≤(R3+R4) / f2≤2.40. In this way, the surface shape of the second lens L2 can be reasonably controlled, which helps to reduce the sensitivity of the camera optical lenses 10, 20, 30, 40, 50, 60, and 70, and can also reduce the stray light generated by the lens and improve the imaging quality of the lens.

[0076] When the above conditions are met, the camera optical lenses 10, 20, 30, 40, 50, 60, 70 have good optical performance and can meet the design requirements of large field of view, large depth of field and high-definition imaging; according to the characteristics of the camera optical lenses 10, 20, 30, 40, 50, 60, 70, the camera optical lenses 10, 20, 30, 40, 50, 60, 70 are particularly suitable for mobile phone camera lens assemblies, WEB camera lenses and medical imaging equipment composed of high-pixel CCD, CMOS and other camera elements.

[0077] The total optical length of the camera optical lenses 10, 20, 30, 40, 50, 60, and 70 is defined as TTL, satisfying the following conditional expression: 5.50≤TTL / f≤7.00, and specifying a telephoto ratio. By being less than an upper limit value of the conditional expression, the total optical length can be shortened, making it easy to achieve miniaturization. On the other hand, by being greater than a lower limit value of the conditional expression, it is easy to correct distortion and axial chromatic aberration, thereby maintaining good optical performance.

[0078] The first lens L1 is made of plastic, the second lens L2 is made of plastic, the third lens L3 is made of plastic, and the fourth lens L4 is made of glass, so that the material properties can be effectively distributed and the chromatic aberration can be effectively corrected to make the chromatic aberration |LC|≤7.0μm. Of course, each lens can also be made of other materials, but at least one of them is made of glass.

[0079] The maximum absolute value of the distortion within the 0.7 field of view of the camera optical lens is defined as Dmax, which satisfies the following condition: Dmax≤2.00%.

[0080] Based on the above conditional expressions and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0081] The object side surface of the first lens L1 is convex or concave at the paraxial position, and the image side surface is concave at the paraxial position. The object side surface and the image side surface of the first lens L1 can also be set to other concave or convex distributions.

[0082] The central curvature radius of the object side surface of the first lens L1 is defined as R1, and the central curvature radius of the image side surface of the first lens L1 is defined as R2, satisfying the following condition: 0.57≤(R1+R2) / (R1-R2)≤1.30. The shape of the first lens L1 is reasonably controlled so that the first lens L1 can effectively correct the system spherical aberration.

[0083] The axial thickness of the first lens L1 is d1, which satisfies the following condition: 0.08≤d1 / TTL≤0.15. Within the range of the condition, it is conducive to achieving ultra-thinness.

[0084] The object side surface of the second lens L2 is convex at the paraxial position, and the image side surface of the second lens L2 is concave at the paraxial position. The object side surface and image side surface of the second lens L2 can also be set to other concave and convex distributions.

[0085] The following condition is satisfied: 2.09≤f2 / f≤3.99. By controlling the positive refractive power of the second lens L2 within a reasonable range, it is beneficial to correct the aberration of the optical system.

[0086] The following conditional formula is satisfied: -7.23≤(R3+R4) / (R3-R4)≤-1.89, which specifies the shape of the second lens L2. When within the range, as the lens develops toward ultra-thin and wide-angle, it is beneficial to correct the axial chromatic aberration problem.

[0087] The axial thickness of the second lens L2 is defined as d3, which satisfies the following condition: 0.14≤d3 / TTL≤0.30. Within the range of the condition, it is conducive to achieving ultra-thinness.

[0088] The object side surface of the third lens L3 is concave or convex at the paraxial position, and the image side surface of the third lens L3 is convex at the paraxial position. The object side surface and image side surface of the third lens L3 can also be set to other convex or concave distributions.

[0089] The following condition is met: 3.56≤f3 / f≤5.39. Through the reasonable distribution of optical focal length, the system has better imaging quality and lower sensitivity.

[0090] The central curvature radius of the object side surface of the third lens L3 is defined as R5, and the central curvature radius of the image side surface of the third lens L3 is defined as R6, which satisfies the following conditional formula: -0.18≤(R5+R6) / (R5-R6)≤1.04, which specifies the shape of the third lens L3 and is beneficial to the molding of the third lens L3. Within the range specified by the conditional formula, the degree of deflection of light passing through the lens can be alleviated, thereby effectively reducing aberrations.

[0091] The axial thickness of the third lens L3 is defined as d5, which satisfies the following condition: 0.07≤d5 / TTL≤0.15. Within the range of the condition, it is conducive to achieving ultra-thinness.

[0092] The object side surface of the fourth lens L4 is convex at the paraxial position, and the image side surface of the fourth lens L4 is convex at the paraxial position. The object side surface and image side surface of the fourth lens L4 can also be set to other convex and concave distributions.

[0093] The following condition is met: 1.62≤f4 / f≤2.02. Through the reasonable distribution of optical focal length, the system has better imaging quality and lower sensitivity.

[0094] The central curvature radius of the object side surface of the fourth lens L4 is defined as R7, and the central curvature radius of the image side surface of the fourth lens L4 is defined as R8, which satisfy the following condition: -0.16≤(R7+R8) / (R7-R8)≤0.71, which stipulates the shape of the fourth lens L4. When it is within the range, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of off-axis picture angle and other problems.

[0095] The axial thickness of the fourth lens L4 is defined as d7, which satisfies the following conditional expression: 0.10≤d7 / TTL≤0.23. Within the range of the conditional expression, it is conducive to achieving ultra-thinness.

[0096] The camera optical lenses 10, 20, 30, 40, 50, 60, 70 satisfy the following condition: 2.19≤Fno≤3.37, thereby achieving a large aperture and good imaging performance.

[0097] The camera optical lenses 10, 20, 30, 40, 50, 60, 70 satisfy the following conditional formula: 0.38≤TTL≤4.16.

[0098] The camera optical lenses 10, 20, 30, 40, 50, 60, and 70 have the technical effects of large field of view, large depth of field, and high-definition imaging; according to the characteristics of the camera optical lenses 10, 20, 30, 40, 50, 60, and 70, the camera optical lens 10 is particularly suitable for medical imaging equipment.

[0099] The imaging optical lenses 10, 20, 30, 40, 50, 60, and 70 of the present invention will be described below using various embodiments. The symbols described in the various embodiments are as follows: The focal length, axial distance, central curvature radius, and axial thickness are in units of mm.

[0100] TTL: total optical length (the axial distance from the object side of the first lens L1 to the image surface Si), in mm;

[0101] Aperture value Fno: refers to the ratio of the effective focal length of the camera optical lens 10, 20, 30, 40, 50, 60, 70 and the entrance pupil diameter.

[0102] 1.0 Image height IH of the field of view: the height of the field of view corresponding to the effective pixel of the sensor (that is, half of the diagonal length of the effective pixel area of ​​the sensor).

[0103] 1.0 Field of view FOV: The field of view angle corresponding to the effective pixels of the sensor.

[0104] Next, the technical solution of the present invention is specifically described with seven implementation modes. When the scope of the above conditional formula is exceeded, the technical effect of the present invention cannot be achieved.

[0105] (First Embodiment)

[0106] The object-side surface of the first lens L1 is convex at the paraxial position, and the object-side surface of the third lens L3 is concave at the paraxial position.

[0107] Table 1 and Table 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.

[0108]

Table 1

[0109]

[0110] The meanings of the symbols in the table are as follows:

[0111] S1: aperture;

[0112] R: the central radius of curvature at the center of the optical surface;

[0113] R1: the central curvature radius of the object side of the first lens L1;

[0114] R2: the central curvature radius of the image side surface of the first lens L1;

[0115] R3: the central curvature radius of the object side surface of the second lens L2;

[0116] R4: the central curvature radius of the image side surface of the second lens L2;

[0117] R5: the central curvature radius of the object side surface of the third lens L3;

[0118] R6: the central curvature radius of the image side surface of the third lens L3;

[0119] R7: the central curvature radius of the object side surface of the fourth lens L4;

[0120] R8: the central curvature radius of the image side surface of the fourth lens L4;

[0121] R9: the central curvature radius of the object side of the optical filter GF;

[0122] R10: the central curvature radius of the image side of the optical filter GF;

[0123] d: the axial thickness of the lens, the axial distance between lenses;

[0124] d0: the axial distance from the aperture S1 to the object side of the first lens L1;

[0125] d1: axial thickness of the first lens L1;

[0126] d2: the axial distance from the image side surface of the first lens L1 to the object side surface of the second lens L2;

[0127] d3: axial thickness of the second lens L2;

[0128] d4: the axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;

[0129] d5: axial thickness of the third lens L3;

[0130] d6: the axial distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4;

[0131] d7: axial thickness of the fourth lens L4;

[0132] d8: the axial distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5;

[0133] d9: axial thickness of the optical filter GF;

[0134] d10: the axial distance from the image side of the optical filter GF to the image surface Si;

[0135] nd: refractive index of d-line (d-line is green light with a wavelength of 550nm);

[0136] nd1: refractive index of the first lens L1 at the d-line;

[0137] nd2: refractive index of the d-line of the second lens L2;

[0138] nd3: refractive index of the third lens L3 at the d-line;

[0139] nd4: refractive index of the d-line of the fourth lens L4;

[0140] ndg: refractive index of the d-line of the optical filter GF;

[0141] vd: Abbe number;

[0142] v1: Abbe number of the first lens L1;

[0143] v2: Abbe number of the second lens L2;

[0144] v3: Abbe number of the third lens L3;

[0145] v4: Abbe number of the fourth lens L4;

[0146] vg: Abbe number of the optical filter GF.

[0147] Table 2 shows aspherical surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.

[0148]

Table 2

[0149]

[0150] For convenience, the aspheric surface of each lens surface uses the aspheric surface shown in the following formula (1). However, the present invention is not limited to the aspheric surface polynomial form represented by the formula (1).

[0151] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r

[0152] 14 +A16r 16 +A18r 18 +A20r 20 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (1)

[0153] Wherein, k is the cone coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between the point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between the point on the aspheric surface that is r away from the optical axis and the tangent plane tangent to the vertex on the aspheric optical axis).

[0154] Figure 2 , Figure 3A schematic diagram showing axial aberration and chromatic aberration of magnification of light with wavelengths of 655 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm after passing through the imaging optical lens 10 of the first embodiment is shown. Figure 4 FIG. 4 shows a schematic diagram of field curvature and distortion of light having a wavelength of 555 nm after passing through the camera optical lens 10 of the first embodiment. Figure 4 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0155] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 0.197 mm, the image height IH of 1.0 field of view of the camera optical lens 10 is 1.048 mm, the field of view angle FOV of 1.0 field of view of the camera optical lens 10 is 139.66°, and the aperture value Fno of the camera optical lens 10 is 3.03. The camera optical lens 10 meets the design requirements of large field of view, large depth of field and high-definition imaging.

[0156] (Second Embodiment)

[0157] The meanings of the symbols in the second embodiment are the same as those in the first embodiment.

[0158] Figure 5 FIG. 2 shows an imaging optical lens 20 according to a second embodiment of the present invention.

[0159] Tables 3 and 4 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.

[0160]

Table 3

[0161]

[0162]

[0163] Table 4 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[0164]

Table 4

[0165]

[0166]

[0167] Figure 6 , Figure 7 A schematic diagram showing axial aberration and chromatic aberration of magnification of light with wavelengths of 655 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm after passing through the imaging optical lens 20 of the second embodiment is shown. Figure 8FIG. 4 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 20 of the second embodiment. Figure 8 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0168] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 0.197 mm, the image height IH of 1.0 field of view of the camera optical lens 20 is 1.048 mm, the field of view angle FOV of 1.0 field of view of the camera optical lens 20 is 139.49°, and the aperture value Fno of the camera optical lens 20 is 3.04. The camera optical lens 20 meets the design requirements of large field of view, large depth of field and high-definition imaging.

[0169] (Third Embodiment)

[0170] The meanings of the symbols in the third embodiment are the same as those in the first embodiment.

[0171] The difference from the first embodiment is that the object-side surface of the first lens L1 is a concave surface at the paraxial position, and the object-side surface of the third lens L3 is a convex surface at the paraxial position.

[0172] Fig. 9 FIG. 1 shows an imaging optical lens 30 according to a third embodiment of the present invention.

[0173] Tables 5 and 6 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.

[0174]

Table 5

[0175]

[0176]

[0177] Table 6 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[0178]

Table 6

[0179]

[0180]

[0181] Fig.10 , Fig.11 A schematic diagram showing axial aberration and chromatic aberration of magnification of light with wavelengths of 655 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm after passing through the imaging optical lens 30 of the third embodiment is shown. Fig.12 FIG. 4 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 30 of the third embodiment. Fig.12The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0182] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 0.219 mm, the image height IH of 1.0 field of view of the camera optical lens 30 is 1.048 mm, the field of view angle FOV of 1.0 field of view of the camera optical lens 30 is 131.99°, and the aperture value Fno of the camera optical lens 30 is 3.03. The camera optical lens 30 meets the design requirements of large field of view, large depth of field and high-definition imaging.

[0183] (Fourth Embodiment)

[0184] The meanings of symbols in the fourth embodiment are the same as those in the first embodiment.

[0185] The difference from the first embodiment is that the object-side surface of the first lens L1 is a concave surface at the paraxial position, and the object-side surface of the third lens L3 is a convex surface at the paraxial position.

[0186] Fig.13 4. Table 7 and Table 8 show the design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0187]

Table 7

[0188]

[0189]

[0190] Table 8 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0191]

Table 8

[0192]

[0193]

[0194] Fig.14 , Fig.15 A schematic diagram showing axial aberration and chromatic aberration of magnification of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm after passing through the imaging optical lens 40 of the fourth embodiment is shown. Fig.16 FIG. 4 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 40 of the fourth embodiment. Fig.16 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0195] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 40 is 0.208 mm, the image height IH of 1.0 field of view of the camera optical lens 40 is 1.048 mm, the field of view angle FOV of 1.0 field of view of the camera optical lens 40 is 140.77°, and the aperture value Fno of the camera optical lens 40 is 3.00. The camera optical lens 40 meets the design requirements of large field of view, large depth of field and high-definition imaging.

[0196] (Fifth Embodiment)

[0197] The meanings of symbols in the fifth embodiment are the same as those in the first embodiment.

[0198] The difference from the first embodiment is that the object-side surface of the first lens L1 is a concave surface at the paraxial position, and the object-side surface of the third lens L3 is a convex surface at the paraxial position.

[0199] Fig.17 1 and 2 show the design data of the imaging optical lens 50 according to the fifth embodiment of the present invention.

[0200]

Table 9

[0201]

[0202] Table 10 shows aspherical surface data of each lens in the imaging optical lens 50 according to the fifth embodiment of the present invention.

[0203]

Table 10

[0204]

[0205]

[0206] Fig.18 , Fig.19 A schematic diagram showing axial aberration and chromatic aberration of magnification of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm after passing through the imaging optical lens 50 of the fifth embodiment is shown. Fig. 20 FIG. 4 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 50 of the fifth embodiment. Fig. 20 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0207] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 50 is 0.224 mm, the image height IH of 1.0 field of view of the camera optical lens 50 is 1.048 mm, the field of view angle FOV of 1.0 field of view of the camera optical lens 50 is 123.93°, and the aperture value Fno of the camera optical lens 50 is 3.36. The camera optical lens 50 meets the design requirements of large field of view, large depth of field and high-definition imaging.

[0208] (Sixth Embodiment)

[0209] The meanings of symbols in the sixth embodiment are the same as those in the first embodiment.

[0210] The difference from the first embodiment is that the object-side surface of the first lens L1 is a concave surface at the paraxial position, and the object-side surface of the third lens L3 is a convex surface at the paraxial position.

[0211] Fig.21 1 and 2 show the design data of the imaging optical lens 60 according to the sixth embodiment of the present invention.

[0212]

Table 11

[0213]

[0214] Table 12 shows aspherical surface data of each lens in the imaging optical lens 60 according to the sixth embodiment of the present invention.

[0215]

Table 12

[0216]

[0217]

[0218] Fig. 22 , Fig.23 A schematic diagram showing axial aberration and chromatic aberration of magnification of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm after passing through the imaging optical lens 60 of the sixth embodiment is shown. Fig.24 FIG. 4 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 60 of the sixth embodiment. Fig.24 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0219] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 60 is 0.224 mm, the image height IH of 1.0 field of view of the camera optical lens 60 is 1.048 mm, the field of view angle FOV of 1.0 field of view of the camera optical lens 60 is 142.85°, and the aperture value Fno of the camera optical lens 60 is 2.19. The camera optical lens 60 meets the design requirements of large field of view, large depth of field and high-definition imaging.

[0220] (Seventh Embodiment)

[0221] The meanings of symbols in the seventh embodiment are the same as those in the first embodiment.

[0222] The difference from the first embodiment is that the object-side surface of the third lens L3 is a convex surface at the paraxial position.

[0223] Fig.25 13 and 14 show the design data of the imaging optical lens 70 according to the seventh embodiment of the present invention.

[0224]

Table 13

[0225]

[0226] Table 14 shows aspherical surface data of each lens in the imaging optical lens 70 according to the seventh embodiment of the present invention.

[0227]

Table 14

[0228]

[0229]

[0230] Fig.26 , Fig. 27 A schematic diagram showing axial aberration and chromatic aberration of magnification of light with wavelengths of 655 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm after passing through the imaging optical lens 70 of the seventh embodiment is shown. Fig.28 FIG. 4 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 70 of the seventh embodiment. Fig.28 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0231] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 70 is 0.204 mm, the image height IH of the camera optical lens 701.0 field of view is 1.048 mm, the field of view angle FOV of the camera optical lens 70 1.0 field of view is 140.06°, the aperture value Fno of the camera optical lens 70 is 3.03, and the camera optical lens 70 meets the design requirements of large field of view, large depth of field and high-definition imaging.

[0232] Table 15 shows the values ​​corresponding to the parameters specified in the conditional expressions of various numerical values ​​in each of the first, second, third, fourth, fifth, sixth and seventh embodiments.

[0233]

Table 15

[0234]

[0235] Those skilled in the art will appreciate that the above-mentioned embodiments are specific embodiments for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A camera optical lens, characterized in that: The camera optical lens comprises four lenses in total, and the four lenses are, from the object side to the image side, in order: a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, and a fourth lens with positive refractive power; Among them, the focal length of the camera optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the field of view angle of 1.0 field of view of the camera optical lens is FOV, the aperture value of the camera optical lens is Fno, the edge thickness of the optical effective diameter of the first lens is ET1, the axial thickness of the first lens is d1, the central curvature radius of the object side of the second lens is R3, the central curvature radius of the image side of the second lens is R4, and the following conditional formula is satisfied: -1.40≤f1 / f≤-1.15; 35.00≤FOV / Fno≤66.00; 2.00≤ET1 / d1≤2.90; 1.70≤f3 / f4≤3.20; 0.60≤(R3+R4) / f2≤2.

40.

2. The imaging optical lens according to claim 1, characterized in that: The total optical length of the camera optical lens is TTL and satisfies the following conditional formula: 5.50≤TTL / f≤7.

00.

3. The imaging optical lens according to claim 1, characterized in that: At least one of the first lens, the second lens, the third lens and the fourth lens is made of glass.

4. The imaging optical lens according to claim 1, wherein: The maximum absolute value of the distortion within the 0.7 field of view of the camera optical lens is Dmax, and satisfies the following conditional formula: Dmax≤2.00%.

5. The imaging optical lens according to claim 1, wherein: The image side surface of the first lens is concave at the paraxial position; The total optical length of the camera optical lens is TTL, the central curvature radius of the object side of the first lens is R1, the central curvature radius of the image side of the first lens is R2, and the following conditional formula is satisfied: 0.57≤(R1+R2) / (R1-R2)≤1.30; 0.08≤d1 / TTL≤0.

15.

6. The imaging optical lens according to claim 1, characterized in that: The object side surface of the second lens is convex at the paraxial position, and the image side surface of the second lens is concave at the paraxial position; The total optical length of the camera optical lens is TTL, the axial thickness of the second lens is d3, and the following conditional formula is satisfied: 2.09≤f2 / f≤3.99; -7.23≤(R3+R4) / (R3-R4)≤-1.89; 0.14≤d3 / TTL≤0.

30.

7. The imaging optical lens according to claim 1, characterized in that: The image side surface of the third lens is convex at the paraxial position; The total optical length of the camera optical lens is TTL, the central curvature radius of the object side of the third lens is R5, the central curvature radius of the image side of the third lens is R6, the axial thickness of the third lens is d5, and the following conditional formula is satisfied: 3.56≤f3 / f≤5.39; -0.18≤(R5+R6) / (R5-R6)≤1.04; 0.07≤d5 / TTL≤0.

15.

8. The imaging optical lens according to claim 1, wherein: The object side surface of the fourth lens is convex at the paraxial position, and the image side surface of the fourth lens is convex at the paraxial position; The total optical length of the camera optical lens is TTL, the central curvature radius of the object side of the fourth lens is R7, the central curvature radius of the image side of the fourth lens is R8, the axial thickness of the fourth lens is d7, and the following conditional formula is satisfied: 1.62≤f4 / f≤2.02; -0.16≤(R7+R8) / (R7-R8)≤0.71; 0.10≤d7 / TTL≤0.

23.

9. The imaging optical lens according to claim 1, characterized in that: The following conditions are met: 2.19≤Fno≤3.37.

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